Low loss phase shifter based on piezocontrolled dielectric composite

Abstract

A "high-/spl epsiv/ dielectric-air slot" layered sandwich composite is used for fast tunable low loss phase shifters. This composite effective dielectric constant /spl epsiv//sub ef/ is controlled by a modern fast actuator that changes the width of the air slot. Using the highest quality microwave dielectrics, it is possible to realize a low loss phase shifter in the microwave and mm-wave range.